Combing cylinder for combing machine

ABSTRACT

A combing cylinder for a combing machine in which a combing segment is eccentrically mounted on a base cylinder with the center of curvature of the combing segment, located on or in the neighborhood of an extension of a radial line which interconnects the rotational axis of the base cylinder and the combing ending point of the combing segment so that the distance from the rotational axis of the base cylinder to the combing starting point of the combing segment is greater than the distance from rotational axis to the combing ending point of the combing segment.

United States Patent Horiuchi et al. 1 Dec. 2, 1975 1 COMBING CYLINDER FOR COMBING 3,184,799 5/1965 Gauvain 19/225 MACHINE 3.419941 l/l969 Moriwaki 19 234 [75] Inventors: Tatsuo Horiuchi, Wakayama; Akira FOREIGN PATENTS OR APPLICATIONS Moriwaki, lkeda, both of Japan 13,361 1909 United Kingdom 19/234 [73] Assignee: lgitt; ShIOji Kabushiki Kaisha, Primary Examiner Dorsey Newton 5a apan Attorney, Agent, or Firm-Wenderoth, Lind & Ponack [22] Filed: Feb. 25, 1974 [21] Appl. No.: 445,336 [57] ABSTRAC.T

A combmg cylmder for a combing machine 1n whlch a u combing segment is eccentrically mounted on a base Foreign APpllcallon Prlorlty Data cylinder with the center of curvature of the combing Feb. 28, 1973 Japan 48-24569 segment, located on or in the neighborhood of an extension of a radial line which interconnects the rota- [52] U.S. Cl. 19/234 tional axis of the base cylinder and the combing end- [51] Int. Cl. D01G- 19/04 ing point of the combing segment so that the distance [58] Field of Search..... l9/2l S, 220, 221, 223-234 from the rotational axis of the base cylinder to the combing starting point of the combing segment is [56] References Cited greater than the distance from rotational axis to the UNITED STATES PATENTS combing ending point of the combing segment.

2,605,512 8/1952 Wilson, ct a1 19/234 1 Claim, 8 Drawing Figures US. Patent Dec. 2, 1975 Sheet 10f3 3,922,757

Fl G. 2 PRIOR ART PRIOR ART Fl 6.4 PRIOR ART PRIOR ART US. Patent Dec. 2, 1975 Sheet 2 of3 3,922,757

COMBING CYLINDER FOR COMBING MACHINE BACKGROUND OF THE INVENTION The present invention relates to a combing cylinder for a combing machine which is referred to as a J type combing machine.

BRIEF DESCRIPTION OF THE DRAWINGS Before explaining the present invention the conventional combing cylinder will first be explained by referring to the drawings wherein:

FIGS. 14 are schematic side views illustrating the combing action of a conventional combing cylinder;

FIGS. and 6 are side views of the principal portions of a combing cylinder of an embodiment according to the present invention;

FIG. 7 is a comparative view showing changes in the gauge; and

FIG. 8 is a schematic side view of a combing cylinder using saw teeth.

DETAILED DESCRIPTION OF THE INVENTION Generally, a combing cylinder for a combing machine is constructed in such a manner that, as shown in FIG. 1, a combing segment 2 consisting of needles 3 or saw teeth wires 4 is arcuately mounted on a base cylinder 1 along a portion of the peripheral surface thereof, the combing segment being attached thereto as an arcuate surface concentric with base cylinder 1 over the tooth tip portion extending from the combing starting point A to the combing endingpoint B in consideration of the rotary motion of the combing cylinder. As is known in the art, it is so arranged as to apply a combing action to fibers gripped between a nipper 5 and a cushion plate 6 in conjunction with the reciprocating motion of the nipper and cushion plate.

An analysis of the above-described known combing motion and the action of a J type combing machine will now be made by taking as an example a needle type combing segment having 17 axial rows of needles.

'Ihe combing action of a combing segment 2 is influenced by a clearance (gauge S) between the lowermost end 7 of the nipper 5 and needles 3, and such gauge S is relatively narrow (0.3 0.5 mm.) at a position where the combing ending point B of the combing segment 2 and the lowermost end 7 of the nipper 5 come closest to each other, and is determined on the basis of such value. Generally, gauge S becomes gradually wider toward the first row of needles, that is, toward the combing starting point A in conjunction with the reciprocating motion of the nipper 5. Moreover, in conjunction with the relative motion between the nipper 5 and the combing segment 2, when the combing starting point A of the combing segment 2 acts on a group of fibers F gripped by the nipper 5 the combing starting point A has already been moving away from the lowermost end 7 of the nipper as shown in FIG. 3, and then, as shown in FIG. 4, the following rows of needles successively act on the group of fibers F along with the rotation of the combing segment 2 and the retraction of the lowermost end 7 of the nipper 5. Therefore, the portion which exerts a satisfactory and effective combing action on the group of fibers F is the rows of needles which follow the intermediate one on the combing segment 2, and it has been found that the rows of needles in the first half fail to act effectively on the group of fi- 2 bers F because of the larger gauge S between them and the lowermost end 7 (see FIGS. 2 4).

The present invention has been accomplished to remedy the drawbacks described above. According to the present invention, as illustrated by an embodiment thereof in FIGS. 5 and 6, a combing segment 2 is mounted on a base cylinder 1 in such a manner that the distance R, between the rotational axis 0 of the base cylinder 1 to the combing starting point A of the combing segment 2 is greater than the distance R from rotational axis 0 to the combing ending point B of combing segment 2. For accomplishing this, in the embodiment of FIG. 5, the length of the portion of needles which project outwardly from a needle supporting member is made gradually larger as the combing starting point A is approached from the combing ending point B.

On the other hand, in the embodiment of FIG. 6, the combing segment 2 consists of a base sector 12 and a plurality of needles 11 of the same length mounted on the outer surface of the base sector 12 in side by side relation in a circumferential direction of the combing segment 2. Each of the needles 11 are of the same height. In order to make the distance R, from the rotational axis 0 of the base cylinder 1 to the combing starting point A of the combing segment 2 greater than the distance R from rotational axis 0 to the combing ending point B of combing segment 2, the inner surface of the base sector 12 is formed by an arcuate or cylindrical surface having radius r and having the center of curvature located on rotational axis 0, while the outer surface of the base sector 12 is formed by an arcuate surface having radius r and having the center of curvature located substantially on an extension C of a radial line C interconnecting rotational axis 0 and the combing ending point B. Thus, the thickness of the base sector 12 gradually increases from the minimum value H at the combing ending point B to the maximum value H at the combing starting point A.

In the embodiment of FIG. 5, the length of the portion of needles which project outwardly from the needle supporting member has to be varied at every needle supporting member. On the other hand, in the embodiment of FIG. 6, the base sector 12 of the combing segment 2 can be easily manufactured by casting, and the needles 11 also can be easily manufactured. Therefore, the combing cylinder according to the embodiment of FIG. 6 is easy to manufacture and inexpensive as compared with that of FIG. 5. In the drawings, 8 designates a detaching roller, and 9 designates a top comb.

As for how much greater the above-mentioned distance R from the rotational axis 0 to the combing starting point A should be than the distance R to the combing ending point, this should be determined by the thickness of the group of fibers F based on the number of grains of the resulting combed sliver. That is, it should depend on the amount of cotton feed, but in the case of a J type combing machine a difference of the order of l 2 mm. is effective to greatly increase the number of needle points which effectively act on the group of nipped fibers F as compared to a conventional concentrically mounted combing cylinder of this type.

In order to facilitate the understanding of the present invention, with an example taken of the combing segnent 2 of a J type combing machine having 17 axial rows of needles, the gauges S between the combing segment 2 and the lowermost nipper end, before and after improvement, are compared, the results being shown in the following table.

Present Present Row of Conventional, invention (1) invention (2) needles S (in mm.) S (in mm.) S (in mm.)

2 1.668 0.863 0.810 3 1.440 0.831 0.728 4 1.262 0.801 0.648 5 1.110 0.775 0.575 6 0.983 0.751 0.543 7 0.932 0.738 0.551 8 0.856 0.700 0.579 9 0.830 0.678 0.595 10 0.779 0.650 0.600 11 0.729 0.625 0.601 12 0.678 0.600 0.600 13 0.627 0.574 0.590 14 0.575 0.550 0.562 15 0.525 0.530 0.525 16 0.500 0.500 0.500 17 0.500 0.500 0.500 Notes:

Conventional, R 63.5 mm. R 63.5 mm. Radius of curvature 63.5 mm. Present invention (1), R, 64.5 mm. R 63.5 mm. Radius of curvature R 63.5 mm. Present invention (2),

R 62.5 mm. Radius of curvature 63.5 mm.

As is understood from the above table, by mounting the combing segment 2 on the base cylinder 1 in such a manner that the distance R from the rotational axis 0 of the base cylinder 1 to the combing starting point A of the combing segmnt 2 is slightly greater than the distance R to the combing ending point B, the gauges S between the needles in the first to fifth or sixth rows and the nipper are greatly decreased as shown in FIG. 7. Especially, in the embodiment 2 (FIG. 6) of the present invention, that is, in the case where the combing segment 2 is mounted in such a manner that the center of curvature thereof is located on or in the neighborhood of an extension C of a radial line C which interconnects the rotational axis 0 of the base cylinder 1 and the combing ending point B, a curve showing the gauge S between the individual rows of needles and the lowermost nipper end is in the form of a spoon locus, exerting an ideal combing action, enlarging the region of effective action of the combing segment 2 on the group of nipped fibers F, increasing the number of effective points acting on the group of fibers F, effectively carrying out the improvement of parallelism of the group of fibers and the removal of neps and short fibers, thereby effectively improving the quality of combed sliver.

In the above discussion, the description has been focused mainly on a combing segment having needles mounted thereon, but it is, of course, possible to apply the present invention to a combing segment 2 having parallelly fixed saw teeth wires 4 as shown in FIG. 8. In the case where the present invention is applied to such combing segment 2 with the saw teeth wires 4, the durability which is a preferable feature of combing segment 2 is developed while the lack of the number of points which is a disadvantage is remedied, so that the effect is more remarkable than in the case of a needle combing segment.

Further, in applying the present invention, if the lower surface of the cushion plate 6 contacts the saw teeth or needles which are at the combing starting point A, the lower surface of the cushion plate may be recessed in the form of an arc as shown.

While the principles of the invention have been described above in connection with a specific embodiment thereof, it is to be clearly understood that this description is made only by way of example and is not to be construed as a limitation on the scope of the invention.

What we claim is:

l. A combing cylinder for a combing machine and comprising:

a base cylinder having central rotational axis;

a combing segment having a combing starting point and a combing ending point and including a combing segment base sector and a plurality of saw teeth wire pieces of the same radial length mounted on said base sector in side by side relation in a circumferential direction of said combing segment;

means for mounting said base sector on the outer surface of said base cylinder;

each of said saw teeth wire pieces having a series of saw teeth of the same height;

said combing segment base sector having an inner surface formed by an arcuate surface the center of curvature of which is located on said central rotational axis of said base cylinder;

said combing segment base sector having an outer surface formed by an arcuate surface the center of curvature of which is located substantially on an extension of a radial line which interconnects said rotational axis and said combing ending point of said combing segment; and

the distance between said combing starting point of said combing segment and said rotational axis being greater than the distance between said combing ending point and said rotational axis. 

1. A combing cylinder for a combing machine and comprising: a base cylinder having central rotational axis; a combing segment having a combing starting point and a combing ending point and including a combing segment base sector and a plurality of saw teeth wire pieces of the same radial length mounted on said base sector in side by side relation in a circumferential direction of said combing segment; means for mounting said base sector on the outer surface of said base cylinder; each of said saw teeth wire pieces having a series of saw teeth of the same height; said combing segment base sector having an inner surface formed by an arcuate surface the center of curvature of which is located on said central rotational axis of said base cylinder; said combing segment base sector having an outer surface formed by an arcuate surface the center of curvature of which is located substantially on an extension of a radial line which interconnects said rotational axis and said combing ending point of said combing segment; and the distance between said combing starting point of said combing segment and said rotational axis being greater than the distance between said combing ending point and said rotational axis. 